Maybe Doomsday preppers aren’t so crazy after all.

Susannah Cahalan writes: As nuclear threats loom from countries like Iran and North Korea, the US is knocking the dust off decades-old bunkers intended to protect government officials — and even start a new civilization — in the case of just such a nightmare event.

He focuses on the Cold War-era government bunkers across the country that were built to house the President and various Washington elites — members of a so-called “shadow government” in the worst nuclear Armageddon scenario.

Since September 11, 2001, Congress has intensified their interest in and funding of top secret “Continuity of Government” (COG) in ways not seen since the Cold War. With hundreds of newly declassified documents, the book, currently in development with NBC as a TV show, includes never-before-heard intel on the country’s top secret bunkers — mythical places like Raven Rock and Mount Weather.

Here’s the low down on some of these bunkers down below…

Raven Rock

Lillington, NC • For military
Built near Camp David to house the military, as a backup for the Pentagon — and perhaps even the President — during an emergency, Raven Rock has retained an air of secrecy ever since construction started in 1948.

Not that it could remain completely clandestine, given the 300-person team (including miners poached from theLincoln Tunnel dig) who carved a 3,100-foot tunnel out of granite in Raven Rock Mountain near Blue Ridge Summit, Pennsylvania.

“There were very few engineers with the expertise to hollow out a mountain and build, in essence, a free-standing city inside of it. The US government turned to the construction firm Parsons Brinckerhoff, which had developed unique tunneling expertise working on the New York City subway,” Graff told The Post.

Locals caught on and word spread to the media, who dubbed the project “Harry’s Hole,” after President Truman who greenlit the project.

Opened in 1953 and designed “to be the centerpiece of a large military emergency hub,” Raven Rock provided 100,000 feet of office space (not counting, Graff writes, “the corridors, bathrooms, dining facility, infirmary or communications and utilities areas”) that could hold about 1,400 people comfortably. Two sets of 34-ton blast doors and curved 1,000-foot-long tunnels reduce the impact of a bomb blast. The compound has undergone several rounds of upgrades — new buildings were added as well as updated technology and air filtration systems.

By the fall of the Berlin Wall in 1989, many government officials recommended closing Raven Rock for good. “You’d feel like you’re walking into a dinosaur,” one said. In 1991, President George H.W. Bush ceased 24 hour operations, effectively forcing the site into standby mode.

Then September 11 happened. By the second anniversary of the attacks, the government had injected $652 million in upgrades. The annual budget ballooned and construction started on new buildings … (read more)